<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>coolCSS</title>
    <style>
        h1 {
            background: pink;
            font-size: 100px;
        }
        ul{
            margin: 50px;
        }
        li {

            font-size: 100px;
        }
        a {
            text-decoration: none;
        }
    </style>
</head>
<body>
    <h1>some cool css!</h1>
    <ul>
        <li><a href="/html/button/index1.html">index1</a></li>
        <li><a href="/html/button/index2.html">index2</a></li>
        <li><a href="/html/swiper/index.html">index3</a></li>
    </ul>
</body>
</html>
